Plz fix and read

This app is great Easy to find music, not like going to certain websites that only have certain music.
But the down side is that theres a bug, Like i download music but for the music i download i want it to stay in the file so when i download a song the older songs will just go away and will just disappear. plz fix. And last thing how do i change the music from local to Music Storage Plz help.

Guesit0s about Box MP3 (FREE) - Cloud Downloader & Download Manager for DropBox Music